Phase II Eastern Washington Equivalent Stormwater Manuals

The Washington State municipal stormwater permits require permitted local governments to establish programs that prevent and control the impacts of runoff from new development, redevelopment and construction sites.  Minimum requirements, thresholds and definitions are in Appendix 1 of the municipal stormwater permit.  In addition, local governments in Eastern Washington must adopt a site planning process, and criteria for selection and design of best management practices similar to that described in Ecology’s Stormwater Management Manual for Eastern Washington

Eastern Washington Phase II Permittees have the option of either adopting portions of Ecology’s Stormwater Manual or portions of a regional manual determined to be equivalent to Ecology’s Stormwater Manual. We will update this page as additional information becomes available.

Spokane County Regional Stormwater Manual

On October 8, 2007, The Department of Ecology approved the Spokane County Regional Stormwater Manual as equivalent to the minimum requirements of the Eastern Washington Phase II Municipal Stormwater Permit.

Ecology’s approval letter of October 8, 2007 to Spokane County.  

The December 2007 draft Spokane Regional Stormwater Manual is available on the Spokane County website.
 

Yakima County Regional Stormwater Manual

On February 2, 2010, The Department of Ecology approved the Yakima County Regional Stormwater Manual as equivalent to the minimum requirements of the Eastern Washington Phase II Municipal Stormwater Permit.

Ecology’s letter of Approval of February 2, 2010 to Yakima County.

The January 2010 Yakima County Regional Stormwater Manual is available on the Yakima County website.
 

WSDOT Highway Runoff Manual - Approved for use for WSDOT projects and by local governments for public road projects

On  August 20, 2008, the Department of Ecology approved the Washington State Department of Transportation’s Highway Runoff Manual as functionally equivalent to the Stormwater Management Manual for Eastern Washington. The WSDOT manual is designed for and approved for use only for WSDOT projects and by local governments for public road projects

Ecology contacts for Phase I and Phase II municipal stormwater permit questions

Ecology contacts for technical questions